ZIP Code 94523

94523 is one of California's ZIP codes, delivering to addresses in Pleasant Hill, Contra Costa County.

City: Pleasant Hill
County: Contra Costa County
State: California
Prefix: 945xx

Where this code sits

94523 is part of the 945xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Pleasant Hill.

Pleasant Hill California ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 94523 delivers to without sharing its boundary.

925 Area code 925

ZIP codes nearest 94523

The ZIP codes whose reference points sit closest to 94523.
ZIP code	Distance	Delivers to
ZIP code 94597	2.5 mi	Walnut Creek, CA
ZIP code 94518	2.6 mi	Concord, CA
ZIP code 94520	2.8 mi	Concord, CA
ZIP code 94522	2.9 mi	Concord, CA
ZIP code 94524	2.9 mi	Concord, CA
ZIP code 94529	2.9 mi	Concord, CA
ZIP code 94596	3.5 mi	Walnut Creek, CA
ZIP code 94598	3.5 mi	Walnut Creek, CA

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 94523, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 94523. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.